<template>
  <div>
        <!-- 面包屑 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示信息 -->
            <el-alert title="添加商品信息" type="info" show-icon :closable="false" center></el-alert>
            <!-- 进步条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- 左边导航栏 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs :tab-position="'left'" v-model="activeIndex" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                         <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                         <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                         <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                expand-trigger="hover"
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="cascaderProps"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb,i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到的后台API地址-->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture"
                            :headers="headerObj"
                            :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>

                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片预览对话框 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
  </div>
</template>

<script>
import _ from 'lodash'

export default {
    data(){
        return {
           activeIndex:'0' ,
            //要提交的表单数据    
           addForm:{
               goods_name:'',
               goods_price:0,
               goods_weight:0,
               goods_number:0,
               goods_cat:[],
               pics:[],
               //商品的详情描述
               goods_introduce:'',
               attrs:[]
           },
           //表单校验规则
           addFormRules:{
               goods_name:[
                   {required: true,message: '请输入商品名称', trigger: 'blur'}
               ],
               goods_price:[
                   {required: true,message: '请输入商品价格', trigger: 'blur'}
               ],
               goods_weight:[
                   {required: true,message: '请输入商品重量', trigger: 'blur'}
               ],
               goods_number:[
                   {required: true,message: '请输入商品数量', trigger: 'blur'}
               ],
               goods_cat:[
                   {required: true,message: '请选择商品分类', trigger: 'blur'}
               ]
           },
           //商品分类数据
           catelist:[],
           //级联选择器的配置对象
           cascaderProps: {
                value: 'cat_id',
                label: 'cat_name',
                children: 'children',
            },
            //动态参数列表数据
            manyTableData:[],
            //静态数据列表数据
            onlyTableData:[],
            //上传图片的url地址
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            //图片上传组件的Headers请求头对象
            headerObj:{
                Authorization : window.sessionStorage.getItem("token")
            },
            //预览图片
            previewPath: '',
            //图片预览对话框
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length === 3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    },
    methods:{
        //获取所有商品分类数据
        async getCateList(){
            const { data: res } = await this.$http.get('categories')
            if (res.meta.status !== 200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.catelist = res.data
        },
        //级联选择器选择项发生改变时 触发的事件
        handleChange(){
            console.log(this.addForm.goods_cat);
            //如果级联选择器不是选第三级，则置为空
            if(this.addForm.goods_cat.length !== 3){
                this.$message.info('只能选择三级分类商品')
                this.addForm.goods_cat = []
            }
        },
        //阻止标签页的跳转
        //activeName:将要进入的标签页
        //oldActiveName：即将离开的标签页
        beforeTabLeave(activeName, oldActiveName){
             if(oldActiveName === '0' && this.addForm.goods_cat.length !== 3){
                 this.$message.error('请先选择商品分类')
                 return false
             }
        },
        //
        async tabClicked(){
            //动态参数面板
            if(this.activeIndex === '1'){
                console.log("动态参数面板");
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'many'
                    }
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取动态参数列表失败！')
                }
                
                
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })

                console.log(res.data)

                this.manyTableData = res.data

            }else if(this.activeIndex === '2'){
                console.log("静态参数面板")
                const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{
                    params:{
                        sel:'only'
                    }
                })
                if(res.meta.status!==200){
                    return this.$message.error('获取静态参数列表失败！')
                }
                console.log(res.data)
                this.onlyTableData = res.data
            }
        },
        //处理图片的预览效果
        handlePreview(file){
            console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true 

        },
        //处理移除图片的操作
        handleRemove(file){
            console.log(file)
            //1.获取将要删除的图片的临时路径
            const filePath = file.response.data.tmp_path
            //2.从pics数组中，找到这个图片对应的索引值
            const i = this.addForm.pics.findIndex( x => x.pic === filePath)
            //3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);
        },
        //监听上传成功的事件
        handleSuccess(response){
            console.log(response);
            //1.拼接得到一个图片信息对象
            const picInfo = { pic: response.data.tmp_path}
            //2.将图片信息对象,push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        //添加商品
        add(){
            //console.log(this.addForm);
            this.$refs.addFormRef.validate(async valid => {
                if(!valid){
                    return this.$message.error('请填写必要的表单项')
                }
                //执行添加的业务逻辑
                //lodash cloneDeep()
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                //处理动态参数和静态属性
                this.manyTableData.forEach(item => {
                    const newInfo = {
                        attr_id : item.attr_id,
                        attr_value : item.attr_vals.join(' ')
                    }
                    this.addForm.attrs.push(newInfo)
                })

                this.onlyTableData.forEach(item => {
                    const newInfo = {
                        attr_id : item.attr_id,
                        attr_value : item.attr_vals
                    }
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log(form);

                //发起请求添加商品
                //商品的名称，必须是唯一的
                const {data:res} = await this.$http.post('goods',form)
                if(res.meta.status !== 201){
                    return this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }

    }
}
</script>

<style lang="less" scoped>
.el-checkbox{
    margin: 0 10px 0 0 !important;
}
.previewImg{
    width: 100%;
}
.btnAdd{
    margin-top: 15px;
}
</style>